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Interactive RetroFlow is an open-source program licensed under the GNU General Public
License, version 2, and is thus available for no-charge and can be
redistributed per the terms of that license.

Interactive RetroFlow is written entirely in Python 2.7 and thus should
run on any machine which has Python 2.7 installed. If you don't already
have Python 2.7 you can get it here:
https://www.python.org/. There are no plans to
rewrite Interactive RetroFlow in other languages, eg Ruby, Java,
Modula-3, Fortran, Cobol, Jovial or Python 3.

Interactive RetroFlow can export charts in SVG, PDF and Text formats.
When exporting in PDF format, it uses the Python package "reportlab". If
that package isn't installed then you will get a message saying so at
startup. All other facilities of Interactive RetroFlow will work in
the absence of reportlab, but you won't be able to export charts in PDF
format.

Interactive RetroFlow was developed using the Rapyd-Tk rapid application development
environment. In the unlikely event that you or anyone else is interested in doing some development work on RetroFlow,
we hereby supply the Rapyd Project file which will allow you to work on the RetroFlow project using Rapyd-Tk.